This product requires personal configuration of a portable power bank to use. Thank you This product requires configuring a portable power bank for use, thank you ​Product Name: Luggage Bag/Backpack ​Weight: Approximately 3.65KG/3.8KG ​Size: 32 * 54 * 28CM (expanded to 34CM) ​Material: Oxford cloth ​There are two versions to choose from ​1. Ordinary vacuum bag version ​2. Vacuum bag version with pump ​Capacity: Can hold a 17 inch notebook computer ​function ​There is a USB charging port ​Vacuum bag function ​Smooth silent wheel ​There is a customs password lock ​Waterproof function ​Dry wet separation bag ​Independent laptop bag ​Using the vacuum compression method: ​1. Open the compressed vacuum lined bag ​2, put the clothes on the air-tight zipper ​3. Open the one-way exhaust valve ​4. Press to exhaust the air inside ​The vacuum bag zipper is very difficult to pull and requires both hands to assist in opening. Additionally, there is an instruction manual in the backpack, which is not a quality issue, but a design to prevent air leakage. Please be aware, thank you The vacuum bag zipper is very easy to open and requires two hands to assist in opening. There is also an instruction manual inside, which is not a quality issue, but designed to prevent air leakage. Please be aware, thank you Normal version No pump With pumpWith pump